Abstract
Transmission of UV light with high beam quality and pointing stability is desirable for many experiments in atomic, molecular and optical physics. In particular, laser cooling and coherent manipulation of trapped ions with transitions in the UV require stable, single-mode light delivery. Transmitting even ~2 mW CW light at 280 nm through silica solid-core fibers has previously been found to cause transmission degradation after just a few hours due to optical damage. We show that photonic crystal fiber of the kagomé type can be used for effectively single-mode transmission with acceptable loss and bending sensitivity. No transmission degradation was observed even after >100 hours of operation with 15 mW CW input power. In addition it is shown that implementation of the fiber in a trapped ion experiment increases the coherence time of the internal state transfer due to an increase in beam pointing stability.
Highlights
Standard solid-core silica optical fibers are ideal for low-loss delivery of singletransverse-mode beams from the visible to the infrared spectral range
Transmission of UV light with high beam quality and pointing stability is desirable for many experiments in atomic, molecular and optical physics
We show that photonic crystal fiber of the kagomé type can be used for effectively single-mode transmission with acceptable loss and bending sensitivity
Summary
Standard solid-core silica optical fibers are ideal for low-loss delivery of singletransverse-mode beams from the visible to the infrared spectral range. Experiments on coherent manipulation of trapped ions for precision spectroscopy and optical clocks [1,2,3,4,5,6], quantum information processing [7, 8] and trapped ion simulators [9, 10] all require good beam quality and pointing stability, which is normally precisely what single-mode optical fibers can provide For these applications a loss of a few dB/m is acceptable so long as the transmission remains single-mode and stable over time. We show that use of kagomé-PCF in a trapped ion experiment significantly increases the coherence times of the internal state transfer due to a reduction in beampointing instabilities
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